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STD MilliVoltmeterDIY LEAP#327
License: MIT
Mode: Editors' pick
- 0
Update time：
2021-04-08 04:22:23
Creation time：
2018-01-17 11:19:01
Description
An ATmega328-based millivolt meter based on a design by Scullcom Hobby Electronics. Uses an LTC2400 ADC and LT1019 voltage reference.
I have fabricated the board at OSHPark, built and tested it - all OK! There are a few changes I'd make to the PCB if I did this again - mainly concerning more conventient connector placement.
All the design notes (including code) are available at https://github.com/tardate/LittleArduinoProjects/tree/master/Equipment/MilliVoltmeterDIY/CustomBoardAndEnclosure
Design Drawing
schematic diagram
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| ID | Name | Designator | Footprint | Quantity |
|---|---|---|---|---|
| 1 | ATMEGA328P-AU | U1 | TQFP-32_7X7X08P | 1 |
| 2 | LT1019CS8-2.5PBF | U2 | SOIC-8 | 1 |
| 3 | LTC2400CS8PBF | U3 | SOIC-8 | 1 |
| 4 | 100K | R1,R3 | R0805 | 2 |
| 5 | 1M | R2 | R0805 | 1 |
| 6 | 220K | R4 | R0805 | 1 |
| 7 | 10K | R12,R11,R10,R8,R9 | R0805 | 5 |
| 8 | 10uF | C1,C6 | ELECTRO-SMD-A-3.8MM | 2 |
| 9 | 100nF | C2,C7,C10 | 0805 | 3 |
| 10 | 10nF | C3,C8 | 0805 | 2 |
| 11 | 100uH | L1 | 0805 | 1 |
| 12 | 16MHZ | X1 | OSC-49S-1 | 1 |
| 13 | 22pF | C4,C5 | C0805 | 2 |
| 14 | AMS1117-5.0 | U7 | SOT-223 | 1 |
| 15 | Header-Female-2.54_1x2 | P1,P4,P6 | HDR-1X2/2.54 | 3 |
| 16 | HDR-IDC-2.54-2X3P | P2 | HDR-IDC-2.54-2X3P | 1 |
| 17 | 10Ω | R5,R6 | 0805 | 2 |
| 18 | 1uF | C9 | 0805 | 1 |
| 19 | 220Ω | R7 | 0805 | 1 |
| 20 | 10K | PR1 | RM065-V1 | 1 |
| 21 | Header-Male-2.54_1x3 | P3 | HDR-3X1/2.54 | 1 |
| 22 | Header-Female-2.54_1x10 | P5 | HDR-10X1/2.54 | 1 |
| 23 | Header-Female-2.54_1x4 | P7,P9 | HDR-4X1/2.54 | 2 |
| 24 | 2.2uF | C9-ALT | CAP-D5.0XF2.0 | 1 |
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